Comfort Compass Set includes a precision geometry compass with spring-bow head and center wheel in a plastic wallet. Sandblasting and nickel-plating of metal parts creates a resilient surface. Plastic parts are reinforced with glass-fiber to keep them distortion-free. Sturdy plastic/metal compass features an interchangeable needle, maximum circle diameter of 8-7/8'' (225mm) and length of 6-1/8'' (155mm). Spare parts box includes two pieces of lead and one needlepoint.